a unit of astronomical length based on the distance from Earth at which stellar parallax is 1 second of arc; equivalent to 3.262 light years 同义词：secpar,
PARSEC is a package designed to perform electronic structure calculations of solids and molecules using density functional theory (DFT). The acronym stands for Pseudopotential Algorithm for Real-Space Electronic Calculations.
例句与用法
1.
It contains about 100 clusters in 100 mpc mega parsec , a million parsecs 众多星系团又再组成一个横跨1亿秒差距包含100个星系团的
2.
Typically , a cluster of galaxies contains 1000 galaxies within a million parsecs . in a larger scale , clusters group together to form 一个典型的星系团大小约一百万秒差距，包含大约1000个星系。
3.
513km s mpc , ie , for a celestial object 1 , 000 , 000 parsec away from us , its recession rate is 513km 1 parsec 3 . 26 light years 513 km s mpc ，即一个距离我们一百万秒差距的天体，它的退行速度是每秒513公里一秒差距3 . 26光年。
4.
This is the apparent magnitude of an object at some standard distance from us . this standard distance is chosen to be about 32 light years 10 parsecs , see below 绝对星等是恒星距离为约32光年或10秒差距请参阅下一节时的星等。
5.
First , the improvement in the connection building time and improvement based on hypothesis makes the existing smacs protocol suitable for the wsn . and the paper proves this statement by using the parsec software 通过仿真软件ns对smac协议的能耗、延迟、流量等参数进行仿真测试,进一步论证了smac协议的实用性。
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